Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And humidified
At the same relative humidity
And dehumidified with decrease in wet bulb temperature
And dehumidified with increase in wet bulb temperature

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a low boiling azeotrope with one of the constituents of the mixture
Have high latent heat of vaporisation
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency

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Mass Transfer
Blowdown in a cooling tower

All of these
Is undesirable
Increases the scale forming tendencies of water
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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